Took the advice of going from NC to St. Louis, SD, Montana, Washington earlier this year and it was awesome. Now need to come back from Seattle WA to NC during December. I-90 scares me a little since it can be shut down at any time due to weather and I'm traveling with a dog so want to plan hotels based on pet friendly, best route, lowest elevation. Please let me know suggestions and planning on a 5 day trip, longer if needed but no sight seeing. Thank you.